Litvinenko, a prominent critic of Russian President Vladimir Putin, is believed to have died from ingesting radioactive polonium-210.
Lugovoi also said he has evidence of London's involvement in the death of Litvinenko, who was dosed with radioactive polonium-210.
Litvinenko died Nov. 23 in a London hospital after ingesting radioactive polonium-210.
He was a friend and close associate of Alexander Litvinenko, the former Russian security agent who died in London in 2006 after drinking tea laced with radioactive polonium.
British officials are still puzzled by the use of this poison, the radioactive isotope Polonium 210.
Mr Litvinenko died in 2006 after he was apparently poisoned with the radioactive substance polonium-210.
BBC: Alexander Litvinenko murder was 'London nuclear terror'
He died at a London hospital November 23, 2006, after being poisoned by the radioactive material polonium-210.
Lugovoi, a millionaire with a background in the private security business, had met with Litvinenko in London on Nov. 1, hours before the former KGB operative said he felt ill from poisoning by radioactive substance polonium-210.
Mr Berezovsky was a close friend of murdered Russian emigre and former KGB officer Alexander Litvinenko, who died in 2006 after he was poisoned with the radioactive material polonium-210 while drinking tea at a London meeting.
Litvinenko wound up dead in London from poisoning with an exotic, highly radioactive element called Polonium 210 widely believed to have come from Russia.
One instrument for doing so is radioactive substance called Polonium 210, stuff so toxic that even the assassins seem to be dying from it.
Alexander Litvinenko, a renegade Russian security officer living in London, was killed by poisoning with polonium, a rare radioactive substance, in 2006.
On that day Litvinenko fell sick, suffering (it eventually turned out) the effects of poisoning by polonium, a rare radioactive substance that killed him three weeks later.
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